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Analog Devices Inc./Maxim Integrated MAX1044C/D-C70802
- Part No.:
- MAX1044C/D-C70802
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
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- Datasheet:
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MAX1044C/D-C70802.pdf
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Product details
Overview
MAX1044C/D-C70802 from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V for analog circuitry, delivers 10mA output with 0.5V drop at 5V input, operates from 1.5V to 10V, and features a BOOST pin to raise oscillator frequency above audio band. It replaces ICL7660 in space-constrained portable instrumentation.
For engineers reviewing the MAX1044C/D-C70802 datasheet, MAX1044C/D-C70802 pinout, MAX1044C/D-C70802 application, or MAX1044C/D-C70802 equivalent, key selection criteria include guaranteed 1.5V–10V operation, BOOST-enabled high-frequency switching (up to ~6× nominal), no-external-diode capability, 98% typical power-conversion efficiency, and compatibility with ICL7660/LTC1044 footprints.
Technical Context
The MAX1044C/D-C70802 integrates four on-chip power MOSFET switches, oscillator control circuitry, and internal charge-pump timing logic. Its BOOST pin directly elevates oscillator frequency-by ~6× when tied to V+-reducing output impedance, ripple, and required external capacitor size.
It implements a two-phase switched-capacitor topology: during phase one, CAP+ and CAP− charge C1 across V+; during phase two, C1 transfers charge to C2 to generate inverted output at VOUT. Output voltage is unregulated and load-dependent, with typical output resistance of 65Ω at 25°C and 5kHz oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports single-cell Li-ion, 3.3V/5V logic rails, and legacy 9V battery systems without external regulators. |
| Output Current | 10mA - sufficient to power op-amps, RS-232 transceivers, and low-power ADCs from a +5V rail. |
| Oscillator Frequency | 1kHz (min, MAX1044) - increases to ~6kHz with BOOST = V+, shifting noise out of audible range and reducing C1/C2 size requirements. |
| Power Conversion Efficiency | 98% (typical) - minimizes heat rise and extends battery life in portable equipment. |
| No-Load Supply Current | 200μA max at 5V - enables ultra-low-quiescent operation in always-on sensor nodes. |
| Output Resistance | 65Ω (typ, 25°C) - defines voltage droop under load; reduced by BOOST, higher fOSC, or paralleling devices. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for consumer electronics and industrial HMI panels. |
Pinout & Package
Dice form factor (no package); bare die intended for hybrid assembly or custom module integration. Not housed in DIP, SO, μMAX, CERDIP, or TO-99.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Oscillator frequency boost control | Connect to V+ to increase fOSC ~6×; improves ripple, reduces capacitor size, shifts noise above 20kHz; open for nominal operation. |
| CAP+ | Positive terminal of charge-pump capacitor C1 | Interface point for bucket capacitor; must be low-ESR ceramic or tantalum; trace length critical for EMI control. |
| GND | Ground reference and substrate connection | Substrate tied to GND; requires low-impedance ground plane; shared return path for V+ and VOUT loops. |
| CAP− | Negative terminal of charge-pump capacitor C1 | Completes C1 charging loop; polarity-sensitive; reverse connection causes malfunction or latch-up. |
| VOUT | Inverted output voltage node | Delivers −(V+) ± droop; connects to reservoir capacitor C2 negative terminal; must not exceed GND potential. |
| LV | Low-voltage regulator bypass | Ground for V+ < 3.5V to enable 1.5V operation; open for V+ > 3.5V; improves startup at low input but increases quiescent current. |
| OSC | Oscillator frequency control input | Accepts external capacitor (COSC) to lower fOSC or external HCMOS clock up to 400kHz; sensitive to stray capacitance. |
| V+ | Positive supply input and substrate tie | 1.5V–10V input; also serves as IC substrate connection; requires local 0.1μF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| BOOST pin functionality | Enables oscillator frequency scaling to ~6× nominal, lowering output impedance and enabling smaller external capacitors (e.g., 1μF instead of 10μF). |
| No external diode required | Full 1.5V–10V operation without series diode, simplifying BOM and eliminating forward-voltage loss in negative rail generation. |
| 1.5V minimum supply voltage | Supports direct battery operation down to single alkaline or NiMH cell, enabled by LV pin grounding for sub-3.5V inputs. |
| 98% typical power efficiency | Reduces thermal load in sealed enclosures and extends runtime in battery-powered handheld instruments. |
| Pin-compatible with ICL7660/LTC1044 | Allows drop-in replacement in existing designs using industry-standard 8-pin footprint variants (DIP/SO/μMAX), preserving layout integrity. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply op-amps in portable data loggers require symmetric ±5V rails from a single 5V USB source. IC Role / Device Role / Timing Role: MAX1044C/D-C70802 generates regulated-negative rail via charge-pump inversion; no timing sync needed as internal oscillator suffices. Use Value: Eliminates need for discrete inductor-based DC/DC, reducing solution size by >40% and cost by $0.35 vs. buck-boost alternatives. | Use Scenario: RS-232 line drivers in handheld test equipment must meet ±5V to ±15V driver compliance from 3.3V microcontroller supply. IC Role / Device Role / Timing Role: MAX1044C/D-C70802 provides compliant negative voltage rail; BOOST pin ensures switching noise remains outside audio band (<20kHz) to avoid coupling into analog signal paths. Use Value: Achieves EIA/TIA-232E spec compliance with only two 10μF ceramics and zero magnetics, enabling PCB area reduction of 22 mm². |
| Hand-Held Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters require stable -5V rail for LCD bias and analog front-end references over 0–70°C. IC Role / Device Role / Timing Role: MAX1044C/D-C70802 operates across full commercial temperature range with guaranteed 10mA output; LV pin grounded for reliable 3V battery start-up. Use Value: Delivers consistent -4.85V @ 5mA across temperature, enabling 0.1% reference stability without trimming or calibration. | Use Scenario: Industrial panel meters use 4–20mA loops powered from 24V DC, but onboard analog circuitry needs isolated -5V for signal conditioning. IC Role / Device Role / Timing Role: MAX1044C/D-C70802 inverts locally derived 5V rail; dice form enables embedding into custom ASIC carrier modules with minimal footprint. Use Value: Bare-die integration avoids package parasitics, improving PSRR by 8dB at 100kHz and supporting 16-bit ADC SNR performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CUA | No BOOST pin; fixed oscillator (~10kHz typ); same 1.5V–10V range and 10mA output capability. | Lacks frequency-scaling capability; unsuitable where audio-band noise or capacitor size reduction is critical. | Select ICL7660CUA only if design already uses μMAX package and BOOST functionality is unnecessary. |
| MAX660CPA | Higher output current (100mA); lower dropout (≤0.65V); requires external diodes; different pinout and package (8-pin DIP). | Not pin-compatible; supports higher-power analog stages but increases BOM count and board area. | Choose MAX660CPA when load exceeds 15mA or when tighter regulation is needed beyond charge-pump capability. |
Compared with ICL7660CUA, MAX1044C/D-C70802 offers superior noise performance and design flexibility via BOOST; compared with MAX660CPA, it trades output current for smaller size, zero diodes, and direct ICL7660 footprint compatibility-making it optimal for space- and noise-sensitive 10mA-class applications.
Availability
MAX1044C/D-C70802 is available at Aetrix Electronics and suitable for portable telephones, hand-held instruments, and panel meters requiring stable component supply with commercial-temperature reliability and bare-die integration flexibility.
Supply support for MAX1044C/D-C70802 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1044 product line targets low-power, space-constrained applications needing compact, diode-free voltage inversion or doubling-especially where pin compatibility with legacy ICL7660 designs is mandatory.
FAQ
What is the function of the BOOST pin on the MAX1044C/D-C70802?
The BOOST pin on the MAX1044C/D-C70802 raises the internal oscillator frequency by approximately six times when connected to V+. This reduces output impedance, lowers output voltage ripple, allows smaller external capacitors (e.g., 1μF instead of 10μF), and shifts switching noise above the audio band. When left open, the device operates at its nominal oscillator frequency. The BOOST function is exclusive to the MAX1044 family and absent in ICL7660 variants.
Can the MAX1044C/D-C70802 operate from a 1.5V supply?
Yes, the MAX1044C/D-C70802 operates from 1.5V to 10V. To ensure reliable startup and regulation at 1.5V–3.5V, the LV pin must be connected to GND. At higher voltages (>3.5V), the LV pin should be left open. This dual-mode LV control enables compatibility with both low-voltage battery systems and standard 5V logic rails while maintaining specified 10mA output capability.
Is the MAX1044C/D-C70802 pin-compatible with the ICL7660?
Yes, the MAX1044C/D-C70802 is fully pin-compatible with the ICL7660 across all package variants (DIP, SO, μMAX) and shares identical pin functions-including N.C. for BOOST on ICL7660. This allows direct replacement in existing designs without layout changes. However, the MAX1044C/D-C70802 adds functional BOOST capability, so connecting BOOST to V+ in an ICL7660-design will have no effect but is electrically safe.
Does the MAX1044C/D-C70802 require external diodes for operation?
No, the MAX1044C/D-C70802 does not require external diodes for operation across its full 1.5V–10V supply range and 0°C to +70°C temperature range. Its on-chip MOSFET switches eliminate forward-voltage drop and associated power loss. External diodes are only needed if substituting for older Intersil ICL7660 versions that lack integrated switching; in such cases, a Schottky diode may be added in series with VOUT for backward compatibility.
What is the maximum continuous output current of the MAX1044C/D-C70802?
The MAX1044C/D-C70802 delivers up to 10mA continuous output current with a 0.5V output drop at V+ = 5V. Output current capability scales with input voltage and temperature: at V+ = 10V, it supports ~12mA; at V+ = 2V, it sustains ~5mA. For loads exceeding 10mA, paralleling multiple MAX1044C/D-C70802 units reduces effective output resistance and increases total current capacity proportionally.
MAX1044C/D-C70802 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
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- Topology:
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- Voltage - Input (Min):
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
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- Voltage - Output (Max):
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- Current - Output:
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- Frequency - Switching:
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- Synchronous Rectifier:
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- Supplier Device Package:
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MAX1044C/D-C70802 FAQ
1.How can I place an order for MAX1044C/D-C70802 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1044C/D-C70802 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX1044C/D-C70802 reliable?
The price and inventory of MAX1044C/D-C70802 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1044C/D-C70802 is usually 5 days.
3.What payment methods are accepted for MAX1044C/D-C70802?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1044C/D-C70802 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1044C/D-C70802?
MAX1044C/D-C70802 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1044C/D-C70802 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX1044C/D-C70802?
For technical support, including MAX1044C/D-C70802 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1044C/D-C70802 requirements.
6.How does Aetrix verify that MAX1044C/D-C70802 is sourced from the original manufacturer or authorized distributors?
All MAX1044C/D-C70802 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX1044C/D-C70802 meets industry standards.
7.What is the process for return or replacement of MAX1044C/D-C70802?
All MAX1044C/D-C70802 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1044C/D-C70802, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX1044C/D-C70802 part is unused and in its original packaging.
Return procedure for MAX1044C/D-C70802:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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